Precautions for using clamp meter
1. When measuring on a high-voltage circuit, it is prohibited to use wires from the clamp-type ammeter to another meter for measurement. When measuring the current of each phase of a high-voltage cable, the distance between the cable heads should be more than 300mm and the insulation should be good. The measurement can only be carried out when it is deemed convenient.
2. When observing the timing of the meter, special attention should be paid to keeping a safe distance between the head and the live parts. The distance between any part of the human body and the live body shall not be less than the entire length of the clamp meter.
3. When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, each phase fusible fuse or busbar should be protected and isolated with insulating materials before measurement to avoid short circuit between phases.
4. When using a high-voltage clamp ammeter, pay attention to the voltage level of the clamp ammeter. It is strictly forbidden to use a low-voltage clamp meter to measure the current of a high-voltage circuit. When measuring with a high-voltage clamp meter, it should be operated by two people. Non-duty personnel should also fill in the second work ticket when measuring. They should wear insulating gloves and stand on the insulating pad when measuring. They should not touch other equipment to prevent short circuit or grounding.
5. After the measurement of the clamp-type ammeter is completed, pull the switch to the maximum range to avoid inadvertent overcurrent the next time it is used, and it should be stored in a dry room.
6. When one phase of the cable is grounded, measurement is strictly prohibited. Prevent the occurrence of ground breakdown explosion due to the low insulation level of the cable head, which may endanger personal safety.
7. When using a clamp meter to measure, the current close to the wires will also affect it, so pay attention to the equal position of the three-phase wires.
8. Since the clamp ammeter needs to contact the circuit under test, be sure to check whether the insulation performance of the meter is good before measurement. That is, the casing should be undamaged and the handle should be clean and dry.
9. The clamp ammeter cannot measure the current of bare conductors.
10. It is strictly prohibited to switch the gear of the clamp ammeter during the measurement process. If it is necessary to change gears, the conductor under test should be withdrawn from the clamp before changing gears.
